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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd2c8eeac0d96b67a2c3cfffa8fb4e9903aed5788893d5088ba66922879d3dc' 
  AND token = 'beF8RHst1639FVgCivqyvWPnePWkwTUlB0intPwNsc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}